Safety first: Allow the unit to cool before cleaning.

Adjust brew parameters: Use a slightly coarser grind and ensure proper coffee-to-water ratio.
Limit keep-warm time: Turn off the warming plate after 30–60 minutes or transfer coffee to a thermal carafe.
Clean carafe and basket: Oils and residue can contribute to bitterness. Wash with hot soapy water regularly.
If coffee tastes burnt quickly: The warming plate may be running too hot due to a thermostat issue and may require service.

Brewed coffee tastes bitter or burnt.

Possible Causes